Answer:
8 years
Explanation:
We can use the equal values equation to put your equation into this; 1x +5=1.25 +3
(?I turned the inches into feet) then silve from there
x + 5 = 1.25x + 3
subtract x
5 = 0.25x + 3
subtract 3
2=0.25x
multiply by 4
8=x
In 8 years they will both be 13 feet tall